Not making excuses for him but Anderson played hurt with a separated shoulder most of last year. It's make or break for him this year.
https://www.sny.tv/jets/news/jets-de-henry-anderson-dealing-with-a-shoulder-injury/311072350

He certainly doesn't have perfect mechanics(lower body) and he definitely can't hold the ball so low before he throws. On the other hand has good mobility and throws the ball on the move very well keeping his eyes downfield when he's forced from the pocket. He has all the tools needed to succeed if he gets a year of good coaching.